In my research on this topic, I have found the focus from very early material to that written in the 1800s, the early 1900s and since Vatican II is on the reverence with which the Body of Christ is to be given and received.
At the Last Supper, Jesus and his disciples shared the Jewish Passover meal before Jesus “broke bread” and passed it to his disciples.
The community of believers in the early Church celebrated with a meal before the “breaking of the bread.” There is no indication how this was done but when you “break bread,” you normally use both hands.
Fourth century St. Cyril of Jerusalem wrote, “When you approach, do not put forth the flat hand nor spread your fingers apart, but make your left hand a kind of throne for the right in which to receive Jesus. Receive the Body of Christ in the hollow of your hand, saying ‘Amen.’”
You’ll notice that the emphasis seems to be on the best way to hold the hands so the host does not fall, that is, on the reverence due to Christ.
Cyril says nothing about how Communion should be picked up and brought to the mouth. Therefore, we don’t know how it was done but they may have used the left hand. They didn’t use the paper-thin hosts we do so it may have been simple to use the right for this, too.
Since most people are right-handed, there seemed to be a belief that the right was better. Children who were left-handed were made to use the right hand.
This was probably because growing up left-handed would be a disadvantage in a right-hand oriented world. We have abandoned that practice and make provision for those who use the left.
The Church and even the Gospels followed the idea of the right being more honourable. We used to read the Gospel only from the right side of the altar and the other readings from the left.
The Last Judgment parable has the sheep going to heaven on Jesus’ right while the hell-destined goats are on his left. The risen Jesus is seated at the right hand of the Father, the place of honour. This was really a way of expressing honour because the right is the norm.
More recently, we have been encouraged to cup the left into the right hand, receive the host into our left and pick it up with the right hand to bring it to the mouth. Therefore, both hands are used, the left receiving Christ and the right bringing him to be consumed.
So, I don’t see any problem in also bringing the host to the mouth with the left hand as long as Communion is received with respect and the right intention.
If you are sensitive or fear getting diseases, I believe you can refrain from using the hand that may have just been shaken by someone with a cold. I know of some who do this.
I also know of some who develop mouth sores when they drink from the cup. So, with due consideration for the importance of receiving under both species, they now refrain from the cup and find themselves free of these sores.
FOCUS ON GOD
I think we need to focus more on the love of God coupled with respect. So often I hear Catholics complain how their religious upbringing made them fearful of an ogre God. They did not know the loving God Jesus showed us so clearly.
We need to reflect on Jesus’ reaction to Pharisaic attitudes and Paul’s words about the freedom we should be enjoying in God’s love. It seems to me that God wants us to live confidently in the love and freedom of the children of God. If we live with, in and for Christ, there is nothing to fear.